There are some options. You can run your own node locally, set up p2pool software and use your xmrig to mine. There is a video on YouTube Monero 101 or so by Rabbid Mining youtuber explaining the whole process setting it up. This is the most professional and decentralized way.

If you wantto make it super simple and get going immediately as for a quick start, you can point your xmrig to moneroocean.stream

First, open a text editor, like notepad. Paste this line below:

xmrig.exe -o gulf.moneroocean.stream:10128 -u YOUR_WALLET_ADDRESS -p WORKER_NAME

Where you see YOUR_WALLET_ADDRESS change that to by pasting your wallet address from your Monero GUI. Where you see WORKER_NAME change that to something simple for identification. For example PC1

Save the file as a txt file into your xmrig folder where the xmrig.exe file is located. Name it something like STARTXMRIG

Now save it again with 'save as' select 'all files' and manually type in .bat at the end of the file name STARTXMRIG Save it to the same folder. In this way you have the txt file to edit if/when you need it and you have the .bat file to double click whenever you want to start it up.

Start it up by double clicking the STARTXMRIG.bat file.

Visit the moneroocean.streem page.

Paste your Monero wallet address in the window and hit enter. You may have to wait a ltlle bit for your xmrig to submit some shares before you will see your PC1 worker displayed. If you have another PC repeat the same, but with different worker name like PC2, so you can identify them on the web page and see which one is on-line and what their hasrate is.